Chlorinated Wide-Bandgap Donor Polymer Enabling Annealing Free Nonfullerene Solar Cells with the Efficiency of 11.5%

Liu, Zhitian; Gao, Yerun; Dong, Jun; Yang, Minlang; Liu, Ming; Zhang, Yu; Wen, Jing; Ma, Haibo; Gao, Xiang; Chen, Wei; Shao, Ming

doi:10.1021/acs.jpclett.8b03247

Title: Chlorinated Wide-Bandgap Donor Polymer Enabling Annealing Free Nonfullerene Solar Cells with the Efficiency of 11.5%

Journal Article · 28 November 2018 · Journal of Physical Chemistry Letters

DOI: https://doi.org/10.1021/acs.jpclett.8b03247 · OSTI ID:1491094

Liu, Zhitian ^[1]; Gao, Yerun ^[2]; Dong, Jun ^[1]; Yang, Minlang ^[1]; Liu, Ming ^[1]; Zhang, Yu ^[1]; Wen, Jing ^[3];

^[3];

^[1];

^[4]; Shao, Ming ^[2]

Wuhan Inst.of Technology, Wuhan (China). Inst. of Materials for Optoelectronics and New Energy, School of Materials Science and Engineering
Huazhong Univ. of Science and Technology, Wuhan (China). Wuhan National Lab. for Optoelectronics
Nanjing Univ. of Technology (China). School of Chemistry and Chemical Engineering
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Univ. of Chicago, IL (United States). Inst. of Molecular Engineering

Substituting the hydrogen atoms on the conjugated side chain of a wide-bandgap polymer J52 with chlorine atoms can simultaneously increase the J_sc, V_oc, and FF of nonfullerene OSCs, leading to an efficiency boost from 3.78 to 11.53%, which is among the highest efficiencies for as-cast OSCs reported to date. To illustrate the impressive 3-fold PCE enhancement, the chlorination effect on the optical properties and energy levels of polymers, film morphology, and underlying charge dynamics is systematically investigated. Grazing incidence wide-angle X-ray scattering studies show that chlorinated J52-2Cl exhibits strong molecule aggregation, the preferred face-on orientation, and enhanced intermolecular pi-pi interactions, hence increasing the charge carrier mobility by 1 order of magnitude. Moreover, chlorination modifies the miscibility between the donor and acceptor and consequently optimizes the phase separation morphology of J52-2Cl:ITIC blend films. Finallyhese results highlight chlorination as a promising approach to achieve highly efficient as-cast OSCs without any extra treatment.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); Wuhan Institute of Technology (WIT); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1491094

Journal Information:: Journal of Physical Chemistry Letters, Vol. 9, Issue 24; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 65 works

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Title: Chlorinated Wide-Bandgap Donor Polymer Enabling Annealing Free Nonfullerene Solar Cells with the Efficiency of 11.5%

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